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Dhanasekar Kesavan(케사반 다나셰이커),Karthikeyan Krishnamoorthy(케이 카티케 이얀),Sindhuja Manoharan(마노하란 신드후자),Sang-Jae Kim(김상재) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
In this work, we investigated the electrochemical properties of boron-oxy-carbide (BOC) nanostructures prepared via simple hydrothermal assisted carbonization technique. Physico-chemical characterization such as XRD analysis confirmed the formation of BOC nanostructures with the presence of boron suboxides confined in carbon matrix. The field-emission scanning electron microscopic analysis coupled with EDX analysis reveals the formation of cone-like BOC nanostructure with uniform distribution of boron, oxygen, and carbon elements. The electrochemical properties of the BOC electrode are investigated in aqueous electrolyte (1M Li<sub>2</sub>SO<sub>4</sub>), which shows enhanced operating potential of 2.0 V (-1.0 to 1.0 V). The CV shows quasi rectangular shaped profiles at all scan rates portraying the charge storage is due to combination of electric double layer and intercalation capacitance occurred at BOC electrode. The BOC electrode possess a high specific capacitance of 230.5 F g<sup>-1</sup> at a constant current of 1 mA with better electrochemical stability. Benefiting from the unique structural features and embedment of free carbon phase, the BOC nanostructures exhibits excellent electrochemical properties compared to the state of art of supercapacitors.
Mariappan, Vimal Kumar,Krishnamoorthy, Karthikeyan,Pazhamalai, Parthiban,Sahoo, Surjit,Kesavan, Dhanasekar,Kim, Sang-Jae Elsevier 2019 Journal of Power Sources Vol.433 No.-
<P><B>Abstract</B></P> <P>Layered ternary metal chalcogenides and their hybrids are receiving fabulous attention as electrode materials for supercapacitors. Herein, we report a facile one-step hydrothermal preparation of layered famatinite/graphene hybrid-sheets and explored its electrochemical properties as a negative electrode for supercapacitors. The mechanism of formation of 2D/2D hybrid heterostructures comprising famatinite and graphene sheets is discussed using physico-chemical characterization such as X-ray diffraction, Raman spectroscopy, and field emission scanning electron microscopic analyses respectively. The famatinite/graphene hybrid-sheet electrode demonstrates high specific capacitance of about 527.76 F g<SUP>−1</SUP> (specific capacity of 205.24 mAh g<SUP>−1</SUP>) which is 5- and 3- fold higher compared to the bare famatinite and graphene electrodes. This astonishing performance of famatinite/graphene hybrid electrode is due to the enhancement of electrolyte ion insertion/extraction kinetics compared to that of bare famatinite and graphene electrodes, as evidenced using Dunn's method. Further, the famatinite/graphene symmetric supercapacitor exhibits an excellent energy density of about 13.45 Wh kg<SUP>−1</SUP> with the maximal power density of 1250 W kg<SUP>−1</SUP>. Additionally, famatinite/graphene symmetric supercapacitor displays high cyclic stability of 95.5% with marvellous rate capability, indicating great promise towards the commercialization of energy storage device.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 2D famatinite sheets decorated rGO is prepared via one-step hydrothermal method. </LI> <LI> The charge-storage mechanism for a hybrid electrode is reviled. </LI> <LI> The famatinite/graphene SSC exhibit an excellent energy density of 13.45 Wh kg<SUP>−1</SUP>. </LI> <LI> Famatinite/graphene SSC shows outstanding stability and marvelous rate capability. </LI> </UL> </P>